son-gui and gatekeeper changes for adding MANO references

[ashwinprasadme]

• Progress on setting up docker environment
• All the required changes made to ruby, sintara and others
• Working on debugging and workflow

[ashwinprasadme]

The task list as discussed to take this forward

• [ ] Fix the docker run and debug environment for testing gtkapi
• [ ] Add a simple GET request to gtkapi and test if it is working
• [ ] Decide the MANO instances schema and decide where to store the tables
• [ ] Make a copy of existing VIM handler code and use it as an example for adding MANO instances
• [ ] Add a POST request handler to gtkapi to receive new MANO instances(if needed add a separate docker for this)
• [ ] Add a GET request to receive added MANO instances from the stored database
• [ ] Make modifications to the frontend to make REST calls to the new calls and test adding and listing
• [ ] Publish gtkapi docker image to own docker hub repository
• [ ] Make changes to ansible installation to automatically install published gtkapi docker image